package com.sky.aspect;




//自定义切面，实现公共字段自动填充


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import net.bytebuddy.asm.Advice;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j//酸辣粉四斤
public class AutoFillAspect {


    //    切入点 注释是为了拦截Mapper的方法
    @Pointcut("execution(* com.sky.mapper.*.*(..))&& @annotation(com.sky.annotation.AutoFill)" )    //在mapper类中的方法,然后还需要有annotation的定义
    public void autoFillPointCut(){}

    //前置通知 在通知中进行公共字段赋值
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException {
        log.info("开始进行公共字段自动填充");

        //获取当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature(); //方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取的方法上的注解对象
        OperationType operationType = autoFill.value();//获得数据库的操作类型

        //获取到当前被拦截方法的参数,获取实体对象比如Employee对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length==0) {
            return;
        }
        Object entity = args[0];        //因为对象不确定就用Object接受

        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        if(operationType == OperationType.INSERT){


            try{
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod("setCreateUser", Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);


                //通过反射为对象赋值
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            }catch (Exception e){
                e.printStackTrace();
            }

            //为四个公共字段赋值


        }else if(operationType == OperationType.UPDATE){
            try{
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);

                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            }catch (Exception e){
                e.printStackTrace();
            }
        }


        //公共属性包括creatTime,createUser等
        //再说一边User是通过Treadlocal来获得的

        //根据操作类型,为对应的操作赋值
    }

}
